Improved rock-drill



UNITED STATES PATENT OEEICEO JLIUS C. DICKEY, OF NEW YORK, N. Y.

IMPROVED ROCK-DRILL..

Specification forming part of Letters Patent No. 55,070, dated May 29, 1866.

To all whom it may concern:

Be it known that I, JULIUS O. DICKEY, of New York, in the county of New York and State ot' New York, have invented a new and Improved Mode of' Constructing Rock-Drills for Boring Oil-Wells, and l do hereby declare that the following is a full and exact description thereof, reference being had to the accompanying drawings, and to the letters of reference marked thereon.

Figure lis a perspective View, FigZ a longi-v tudinal section, Fig. 3 a cross-section, and Fig. 4 a perspective View, of the drill-bit B.

I make the central drill-bit, B, with shoulders, E E, against which the bits A and C rest, said bits A and O being made with a tenon, D, which is inserted in` a hole m'a'de in`shoulders E E, the several bits being secured together by bolt F, the drill being rotated in the well. When the bits A and C are made one foot or more in length the bolt should be made with a head on one end and with'anut on the other end. The central part of the lower end of bit B I make with a cuttil'lg-edge, or otherwise.

The bits combined will eut the rock so as to forni a core in the center of the well, which Vcore will make the drill work more perpendicular and drill a more perpendicular well.

The number of bits are increased in proportion to the size of the well to be bored.

By this combin ation of the bits I ain en abled4 to make a cheaper and more durable drill than could be otherwise made.

What l. claim as my invention, and desire to secure by Letters Patent, is-

The combination of the drill-bits A, B, and C, substantially as set forth.

J ULIS C. DICKEY.

Witnesses:

E. M. OsBoRNE, M. M. LIVINGSTON. 

